<template>
    <div>
        <!-- 顶部滑动条 -->
        <div id="slider" class="mui-slider">
            <div id="sliderSegmentedControl" class="mui-scroll-wrapper mui-slider-indicator mui-segmented-control mui-segmented-control-inverted">
                <div class="mui-scroll">
                    <!-- 注意，这个时候点击会切换高亮，这不是路由的高亮而是scroll导致的 -->
                    <!-- 还有item.id == 0是默认 -->
                    <a :class="['mui-control-item',item.id == 0 ? 'mui-active':'']"
                    v-for = "item in cates" :key = "item.id" @tap="getPhotoListByCateId(item.id)">
                        {{item.title}} 
                    </a>
                   
                </div>
            </div>

        </div>
        <!-- 底部图片列表 -->
        <ul class="photo-list">
            <router-link v-for="item in list" :key=item.id :to="'/home/photoinfo/'+item.id" 
            tag="li">
              <img v-lazy="item.img_url">
              <div class="info">
                  <h1 class="info-title">
                      {{item.title}}

                  </h1>
                  <div class="info-body">
                      {{item.zhaiyao}}

                  </div>
              </div>
            </router-link>
          </ul>
        
    </div>
</template>

<script>
    
    import mui from "../../lib/mui/js/mui.min.js";
    export default {
        data() {
            return {
                cates: [],
                // 图片列表
                list: []

            }
        },
          // 当 组件中的DOM结构被渲染好并放到页面中后，会执行这个 钩子函数
    // 如果要操作元素了，最好在 mounted 里面，因为，这里时候的 DOM 元素 是最新的
    
        mounted() {
            mui('.mui-scroll-wrapper').scroll({
              deceleration: 0.0005 //flick 减速系数，系数越大，滚动速度越慢，滚动距离越小，默认值0.0006
            });
      	
        },
        created() {
            this.getAllCategory();
            this.getPhotoListByCateId(0);
        },
        methods: {
            getAllCategory() {
                this.$http
                .get("api/getimgcategory")
                .then(result => {
                    if(result.body.status === 0){
                        result.body.message.unshift({title: '全部', id: 0});
                        this.cates = result.body.message;

                    }
                    
                })
            },
            getPhotoListByCateId(cateId) {
                this.$http
                .get('api/getimages/'+cateId)
                .then(result => {
                    if(result.body.status === 0){
                        this.list = result.body.message;
                    }
                })
            }
        },
    }
    

</script>

<style lang="scss" scoped>
    /* 这里如果用了none的话安卓手机调试的时候页面不能纵向滑动所以改成了pan-y */
     *{ touch-action: pan-y;  }
     
    .photo-list {
        list-style: none;
        margin: 0;
        padding: 10px;
        padding-bottom: 0;
        li{
            background-color: #ccc;
            text-align: center;
            margin-bottom: 10px;
            box-shadow: 0 0 9px #999;
            position: relative;
            img{
                width: 100%;
                vertical-align: middle;

            }
            /* 这里是懒加载和上面的img是不一样的 */
             img[lazy=loading] {
                width: 40px;
                height: 300px;
                margin: auto;
           }
           .info {
            color: white;
            text-align: left;
            position: absolute;
            bottom: 0px;
            background-color: rgba(0, 0, 0, 0.4);
            max-height: 84px;
             .info-title {
                 font-size: 14px;

             }
             .info-body {
                 font-size: 13px;

             }

           }
        }
    }
  
   
</style>